Difference between virgin birth of Christ and Krishna

Many Hindus and follower of Hare Krishna Movement attribute of Krishna being born of virgin like Jesus Christ of Christianity. But according to Hindu scriptures mother of Krishna had already given birth to 7 children. On the other hand according to Bible parents of Jesus Christ were both virgins. The Hare Krishna Movement has been using the strategy of virgin birth myth of Krishna to make him Christ, but Bible depicts pure virgin of only Jesus making him the genuine Christ.